Not in C++

In C++, not is a logical operator used to negate the truth value of a condition. The not operator works with Boolean expressions, which means it only works with values that are either true or false.

Here's an example of how to use not in C++:

``c++
bool is_raining = false;
if (not is_raining) {
cout << "It is not raining!" << endl;
}


In this example, we have a boolean variable is_raining that is initially set to false. The not operator is used to negate the Boolean expression is_raining. Since is_raining is false, its negation is true. Therefore, the output of this program will be "It is not raining!".

Another example of using not is as follows:

In this example, we have two integer variables x and y. The not operator is used to negate the Boolean expression (x == y). Since x is not equal to y, the expression (x == y) evaluates to false, and its negation evaluates to true. Therefore, the output of this program will be "x is not equal to y".

Note that the not operator is equivalent to the ! operator in C++. So, the above two examples can also be written using the ! operator as follows:

if (!(x == y)) {
cout << "x is not equal to y" << endl;
}
`

Both not and !` operators can be used interchangeably in C++.